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Finding the Fourth Proportional to 138,900.75, 208,627.90 and 131,067.20

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Solution

The fourth proportional to 138,900.75, 208,627.90 and 131,067.20 is: 196,861.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,900.75 : 208,627.90 = 131,067.20 : x
  2. Step 2: Convert to fraction form
    138,900.75/208,627.90 = 131,067.20/x
  3. Step 3: Cross multiply
    138,900.75x = 208,627.90 × 131,067.20
  4. Step 4: Simplify right side
    138,900.75x = 27,344,273,324.07
  5. Step 5: Solve for x
    x = 27,344,273,324.07/138,900.75
  6. Step 6: Final answer
    x = 196,861.96

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.